In my limited experience the Mini 14 is a rugged, reliable rifle. I have a 580 series stainless ranch rifle that I bought used (unknown round count). From the get-go, it has been nothing but utterly reliable with any type of ammunition I have thrown at it (Tula FMJ, Silver Bear JHP, Wolf FMJ, WWB FMJ, Fiocchi FMJ) using Ruger magazines. Specifically, I have used it in several shooting sessions whereby I went through 350+ rounds of steel case ammo in the period of an hour. Thus far no breakages or noticeable wear to speak of.
Granted I am not a service member or LEO that really puts the rifle through its paces in harsh field conditions, but this rifle has earned my respect more than any other rifle I own. This may not mean much, but as a reference, the same steel case ammo (Tula) that I routinely run through the Mini has severely jammed two different AR15s (Double Star and EA, each with chrome-lined bores/chambers and 5.56 barrels), and a Daewoo DR200 (also with a chrome-lined bore/chamber in 5.56).
Thus far no breakages or wear to speak of with the rifle.
YMMV.
Granted I am not a service member or LEO that really puts the rifle through its paces in harsh field conditions, but this rifle has earned my respect more than any other rifle I own. This may not mean much, but as a reference, the same steel case ammo (Tula) that I routinely run through the Mini has severely jammed two different AR15s (Double Star and EA, each with chrome-lined bores/chambers and 5.56 barrels), and a Daewoo DR200 (also with a chrome-lined bore/chamber in 5.56).
Thus far no breakages or wear to speak of with the rifle.
YMMV.